https://en.wikipedia.org/wiki/Standard_illuminant
A standard illuminant is a theoretical source of visible light with a spectral power distribution that is published. Learn about the CIE illuminants A, B, C, D, E, and F, and how they are used in colorimetry and imaging.

https://www.xrite.com/service-support/understanding_illuminants
Understanding Illuminants. An illuminant is a mathematical representation of a theoretical light source, used for calculating tristimulus values from a spectrophotometric measurement. The numbers represent relative power of the theoretical source for specific wavelengths in the visible spectrum. The relative power distribution of a real light

https://www.merriam-webster.com/dictionary/illuminant
Learn the meaning of illuminant, a noun that refers to an illuminating device or substance, such as a lamp or a candle. See synonyms, examples, word history, and medical definition of illuminant.

https://www.rp-photonics.com/cie_standard_illuminants.html
Learn about the different types of white light sources defined by the CIE (International Commission on Illumination) for colorimetry and lighting applications. Compare the chromaticity coordinates, color temperatures and spectral exitance of standard illuminants A, B, C, D, E, F and LED.

https://link.springer.com/referenceworkentry/10.1007/978-3-642-27851-8_324-1
Learn about the definitions, properties and applications of CIE standard illuminants A and D65, which are spectral power distributions used in colorimetry. Find out how they represent different types of light sources and how they are related to color temperature and optical brighteners.

https://link.springer.com/referenceworkentry/10.1007/978-3-642-27851-8_352-1
The difference between light source and illuminant is that a light source is an actual physical entity, whereas an illuminant may only be a set of values recording its SPD. For example, International Commission on Illumination (CIE) Standard Illuminant A is the SPD of CIE Source A (approximated by an incandescent, tungsten filament light source).

https://link.springer.com/referenceworkentry/10.1007/978-0-387-31439-6_448
Learn about the standard illuminants defined by the International Commission on Illumination (CIE) for accurate color measurement. See the relative spectral power distributions of A, C, D50, D55, D65 and D75 illuminants in the range 300-830 nm.

https://www.sciencedirect.com/topics/engineering/illuminant
An illuminant is a theoretical light source with a specific spectral power distribution (SPD) used for colorimetry. Learn about the standard illuminants defined by CIE, such as A, D65, D50 and D75, and their characteristics and uses in different fields.

https://www.openphotographicsociety.org/photography/colour-light-and-optics/colour/206-standard-illuminants
A standard illuminant is represented by a profile, or graph, of the energy produced by a source of light across the wavelengths of the visible spectrum - a well-defined spectral power distribution.Various standard illuminants are published by the CIE to provide a means of comparing colours or images under different lighting conditions.

https://www.dictionary.com/browse/illuminant
Illuminant definition: an illuminating agent or material.. See examples of ILLUMINANT used in a sentence.

https://www.xrite.com/-/media/xrite/files/apps_engineering_techdocuments/u/understanding_illuminants_en.pdf
Learn how illuminants are defined, measured and used to represent different types of light sources and their effects on color appearance. Compare the spectral power distributions of standard illuminants D50, D65, F2, F7 and F11 and see how they relate to color rendering index and metamerism.

https://onlinelibrary.wiley.com/doi/10.1002/9781118894477.ch8
The illuminants are mathematical tables of values (relative power versus wavelength) used for colorimetric computations. The light sources and illuminants are specified by their spectral distribution of the emitted power, absolute S λ [W/nm] or relative S(λ) [dimensionless]. Conventionally, light sources and illuminants for illumination have colorimetric specification related to the CIE 1931

https://www.image-engineering.de/library/technotes/753-cie-standard-illuminants
Learn about the spectral power distributions of CIE standard illuminants, which are used for colorimetric issues. Compare different types of illumination, such as A, B, C, D, E and F, and see examples of color rendering.

https://en.wikipedia.org/wiki/White_point
A white point is a set of chromaticity coordinates that define the color "white" in image capture, encoding, or reproduction. Learn how to convert the color of an object under different illuminants, such as CIE D-series standard illuminants, using various methods and transforms.

https://sensing.konicaminolta.us/us/blog/understanding-standard-illuminants-in-color-measurement/
Learn how illuminants represent the spectral power distribution of different light sources and how they are used to calculate color consistency. Find out how to identify metamerism and choose the right illuminant for your samples based on their end use.

https://link.springer.com/referenceworkentry/10.1007/978-1-4419-8071-7_320
Learn about the spectral power distributions of daylight phases and how they are calculated from chromaticity coordinates and correlated color temperature. Find out the history, definitions, and applications of daylight illuminants in colorimetry.

https://www.mdpi.com/2076-3417/14/13/5717
This research deals with the design problems of LED-based spectrally tunable light sources (LSTLSs). The study aims to assess the reliability of popular models for the spectral modeling of LED radiation and a typically used curve-fitting criterion (R2) in the development of high-quality multi-emitter LED retrofits for incandescent photometric illuminant.

https://support.hunterlab.com/hc/en-us/articles/205071949-What-is-the-difference-between-CIE-F11-and-TL84-illuminants
The CIE illuminant is the average SPD spectral power distribution measurement of several lamps of this type from as many manufacturer that make this type of lam and codified into a standard illuminant table format. TL84 represents a Philips narrow tri-band fluorescent lamp (4000° Kelvin, similar to CIE illuminant F11) typically found in Marks

https://support.hunterlab.com/hc/en-us/articles/203995845-Equivalent-White-Light-Sources-and-CIE-Illuminants-an05-05
An illuminant is a set of numbers (relative energy versus wavelength) that represents the spectral quality of a type of white light source and is used in the calculation of color measurements in colorimetric software. The choice of illuminant is independent of the instrument lamp. Common CIE Illuminants.

https://www.oed.com/dictionary/illuminant_adj
Where does the word illuminant come from? Earliest known use. mid 1600s. The earliest known use of the word illuminant is in the mid 1600s. OED's earliest evidence for illuminant is from 1644, in the writing of Kenelm Digby, natural philosopher and courtier. illuminant is a borrowing from Latin. Etymons: Latin illuminānt-em.

https://www.collinsdictionary.com/dictionary/english/illuminant
2 meanings: 1. something that provides or gives off light 2. giving off light; illuminating.... Click for more definitions.

https://link.springer.com/content/pdf/10.1007/978-3-642-27851-8_324-1.pdf
illuminant D65. The SPD of all illuminants defined by the CIE is available in the Technical Report Colorimetry [4] and the standard on CIE Standard Illuminants for Colorimetry [5]. CIE Standard Illuminant A Originally CIE standard illuminant A (CIE St. Ill. A) was intended to represent typical, domestic, tungsten-filament lighting.

https://www.waveformlighting.com/tech/how-to-calculate-the-daylight-spectrum-d-illuminant/
The D illuminant can be used to approximate the daylight spectrum between 4000K and 25,000K. The inputs needed are the xy coordinates from the 1931 CIE coordinate system, along with the three functions named S0 (blue), S1 (green) and S2 (red).

https://link.springer.com/referenceworkentry/10.1007/978-0-387-31439-6_516
Learn how to determine the direction, intensity, and/or color of the lighting in a scene from image cues. Explore different methods based on shading, cast shadows, specular reflections, and color.